1. Signs and symptoms

2. Diagnosis
     Clinical significance  

3. Management

4. History

5. References

6. External links

Flammer syndrome is a recently described clinical entity comprising a complex of clinical features caused mainly by dysregulation of the blood supply which has previously been called vascular dysregulation. It can manifest itself in many symptoms such as cold hands and feet and is often associated with low blood pressure. In certain cases it is associated with or predisposes for the development of diseases such as a normal tension glaucoma.^[1] Flammer syndrome is named after the Swiss ophthalmologist Josef Flammer.

Signs and symptoms

Most of the symptoms of Flammer syndrome result from an impaired regulation of the blood supply. How these symptoms affect the patient depends on which organ's or body part's blood supply is inhibited. Typical symptoms of Flammer syndrome are cold hands or feet, a low blood pressure, occasional white and red patches on the face or neck, and migraine-like pain or a feeling of pressure behind the upper eyelid. In addition, there are symptoms not directly resulting from dysregulations of the blood supply such as a prolonged time needed to fall asleep,^[2] a reduced feeling of thirst, high sensitivity not only to cold but also to odors, vibrations, psychological stress or certain medications (e.g., calcium antagonists, beta blockers) etc. Pain and muscle spasms are common. People with Flammer syndrome are usually very precise, highly motivated and successful in their professional life.^[3]

Scientific studies have shown that in many patients with glaucoma the cause of the disease are perfusion issues of the optic nerve and retina while intraocular pressure is normal. Many patients with normal tension glaucoma have a basic constitution, which corresponds to the Flammer syndrome. Some of its features were formerly summarized under the term "primary vascular dysregulation syndrome".^[4]

Signs of Flammer syndrome may include:

• cold hands and / or feet
• arterial hypotension
• lower body mass index
• decreased feeling of thirst
• prolongation of time to fall asleep
• increased sensitivity to pain, odor perception, sensitivity to certain drugs
• migraine
• tinnitus
• reversible patchy white or red discoloration of the skin.

People with Flammer syndrome typically respond excessively to mental or physical stimuli such as stress or exposure to cold. The disease is more prevalent in the following groups of people: in women compared to men, in people with lower blood pressure, in Asians compared with Caucasians, it is more frequent among academics than among blue collar-workers. People with Flammer syndrome are usually highly motivated in their professional life, they sleep poorly^[5] and they have a decreased sensation of thirst.^[6]

Diagnosis

The diagnosis of Flammer's syndrome is primarily based on the patient's history with its typical features as well as the findings of nail fold capillaroscopy. This test shows an excessive constriction (narrowing) in the smallest blood vessels (capillaries) of the fingers in response to being exposed to cold as a stimulus. Patients with vasospastic symptoms as they are characteristic for Flammer syndrome have shown a unique gene expression when their lymphocytes underwent gene expression profiling.^[7]

Clinical significance

To have Flammer syndrome does not necessarily mean that this individual is sick. On the contrary: most of those affected are and remain healthy. Certain diseases such as arteriosclerosis and its consequences are probably even rarer. Best known is the higher risk of normal tension glaucoma, a disease with an impaired regulation of blood flow in a large number of patients.^[8] If glaucomatous damage occurs despite normal eye pressure or if glaucomatous damage is progressive despite normalized intraocular pressure, frequently a Flammer syndrome is the cause. In these eyes, an elevated pressure in the retinal veins has been observed.^[9] Glaucoma patients with Flammer syndrome show some specific clinical signs like an increased frequency of the following: optic disc haemorrhages, activated retinal astrocytes, elevated retinal venous pressure, optic nerve compartmentalization and fluctuating diffuse visual field defects.^[10] The association of normal tension glaucoma with the syndrome has recently been confirmed by a group of Chinese researchers.^[11] In a 2016 review on the risk factors for normal tension glaucoma by ophthalmologists from Asia (where this form of glaucoma is much more prevalent than in Europe or North America), Flammer syndrome has been attributed to increase the likelihood of ganglion cell damage in these patients with disc hemorrhages as a characteristic clinical sign.^[12] Migraine attacks, a common feature of Flammer syndrome, have been described as a risk factor for glaucoma progression, in open-angle glaucoma as well as in normal tension glaucoma.^[13] Flammer syndrome may also predispose to other eye diseases such as vascular occlusion (especially retinal vein occlusion)^[14] in relatively young people or central serous retinopathy. Muscle spasms and tension are common among individuals with Flammer syndrome. Tinnitus and sometimes even acute hearing loss can occur. There is currently insufficient data available on cases where Flammer syndrome is suspected like in the sudden, unexpected deaths of young athletes. People suffering from retinitis pigmentosa seem to have Flammer syndrome quite frequently, possible associations with the vascular factor endothelin-1 are under investigation.^[15]

Management

Flammer syndrome requires no therapy as long as a person does not suffer from the symptoms or pathological sequelae occur. The treatment is based on three pillars: a) lifestyle interventions, b) diet and c) medication. A healthy lifestyle should include regular sleep, weight stabilization (in the sense of not being underweight), avoiding periods of fasting and avoidance of known trigger factors such as cold. Regular physical exercise is good, extreme sports might be detrimental. Nutrition should contain lots of antioxidants. Among these are green tea, black filter coffee, red wine, blue berries and fruits etc. Omega-3 fatty acids, especially in the form of fish, improve the regulation of blood flow. If blood pressure is very low, the salt intake should be increased. Drugs that can lead to vasoconstriction should be avoided. If blood pressure is too low, sleeping pills should be taken cautiously. Magnesium and calcium antagonists may help against the vascular dysregulation. With lifestyle interventions attacks - particularly pronounced symptoms such as massive cold extremities, tinnitus or migraine-like episodes - can be avoided or these can at least be reduced. Stabilizing weight (i.e. not being underweight) and the avoidance of periods of fasting are important.^[3]

Medical treatment is necessary when normal tension glaucoma is present. In these cases, in addition to the ophthalmologic treatment of glaucoma, the patient's usually low blood pressure should be addressed. With dietary measures such as salt intake and sometimes with low-dose steroids a drop in blood pressure - especially during sleep - can often be prevented. These nightly "dips" of blood pressure in normal tension glaucoma patients with Flammer syndrome can damage the sensory cells of the retina significantly.^[16]

History

For over 100 years vasospasms are known, particularly in the vessels supplying the retina of the eye with blood. These vasospasms are temporary narrowings of arteries or arterioles, which result in an insufficient supply of blood of the corresponding organs or parts of organs. Such spasms can occur at various locations in the human body; in this case medical terminology calls it "vasospastic syndrome". Over the years, it has been established that these spasms are usually part of a general dysregulation of blood vessels. These dysregulations can occur in spasms as well as in excessive or insufficient dilation of arteries, veins, and capillaries. The blood vessels of individuals suffering from vasospastic syndrome respond to stimuli insufficiently. If an identifiable disease does not cause this, it is called a primary vascular dysregulation (PVD); in case of an underlying disease it is called secondary PVD. PVD is almost always associated with other vascular and non-vascular symptoms and signs.^[17] This entire complex (PVD and accompanying symptoms) is today called Flammer syndrome.{{citation needed|date=December 2017}}

References

External links

• Website on Flammer syndrome
• Scientific essay on Flammer syndrome

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